Abstract
During a series of rains, we have often had a period during which we had much rainfall being beyond our comprehension. Selecting two examples from these cases, we have estimated carefully each effects due to topography, large scale disturbance, frontal friction and convective instability.
The results of the estimations are shown in this paper. And it is emphasized that the effect due to the convective instability on the amount of precipitation may be of overwhelming magnitude than the other in heavy rain.
